Derrick elevator



April 9, 1929.

P. R. MEADVILLE DERRI CK ELEVATOR Filed 0G13. l, 1927 2 Sheets-Sheet l ,fyi

fjeadvll@ ATTOR N EY Filed Oct. l, 1927 2 Sheets-Sheet INVENTOR ATTO RN EY Patented r. i995@ UN'ED STATES PETER R. llEADVILLE, OF LAEVTON, OKLAHOMA.

DERRICK ELEVATOR.

Application iled ctober 1, 1927. Serial No. 223,425.

lt is necessary, in oil tields, and as a mat` ter ot tact in other places, where derricks are erected tor the attendant or mechanic to frequently climb the derrick for repairs and for other purposes To acccmplisa this the dcrricks are prov ed with ladders. In oil fields especially thee ladders become satl lli-ated with oil rein:Y the climbing` there of diilicult and d cro firs-o in the wi1 ter time the derricks become ic which adds to the danger of the person ascending and descending the ine.

lt may; therefore, be consideredthe primary object of this invention to provide a derrick with an elevator in the not re oil a man-lift wnicli is des'gncd to supplant the usual ladder andrfhicn is ot a construction and arrangement ufhcreby a person sons may easily,quicklj,f and sate ascend or desc-eno the derricT ,Y there coing means connected with the car ci the cl vater for engaging the derrick to hold the said ca r at din'erent stages on the derrick frame.

A still further object is the provision of a man-lift in the nature of an elevator for derricks in which a car i arranged for vertical movement on one` Le of a derrick and the weight oi? the car 1s counter-balanced so that only asmall expenditure oi physical exertion will be required in the ascent or descent of the car.

A still lfurther object is the provision of a man-litt for derrick trames that shall be of an extremely simple construction and which may be readily, easily and quickly iixed to the side of the derrick frame and further one which will fully protect theoccupant 'of the car against usual dangers and permit of the ready ascent and descent of the car.

To the attainment of the foregoing the invention consists in certain other novel features ot construction, combination and operative association of parts, a satisfactory embodiment of which is disclosed by the accompanying drawings which forni part orn this application.

In the drawings: Y

Figure 1 isa side elevation of a derrick frame provided with the improvement.

Figure 2 is an enlarged central longitudinal sectional view through the improvement as arranged on the derrick trame..

Figure 3 is a sectional view approximately on the line 3 3 oi Figure 2. v

Figure l is a detail sectional View approxi mately on the line il-st of Figure 2.

per-

ln the drawings, the numeral 1 designates derrick trame of the usual construction. For distinction the top platform of the iframe is Yindicated by the numeral 2. Secured to the under face of this platform and likewise secured to the sides of the derrick frame there is the track of my improvement. rlhe track comprises two spaced vertically disposed rails 3*-3. Each of these rails is in the nature of an eye beam, the inner flanges of which being secured to the derrick iframe. Of course, the track is of a length cqualing' the height of the derrick frame.

Fixedly secured to the top platform 2-of the derrick frame, centrally with respect to the rails oix the track, there is a pulley or sheave -"-Jheel d around which is trained a cable 5 and one end of this cable is secured lo the top ci a box or basket 6 which is arranged for movement between the inner or con :cn-fing channels of the I beam rails 3. The sccond end of the cable 5 is tixedly secured to the inner wall of the car 7. The car preferably in the nature of an open member of substantially rectangular formation and has secured to its front and to its sides, adjacent to the top and bottom of the said car, substantially U-shaped metal bars 8, respectively. The bars 8 project a suitable distancc beyond the inner face or rear face of the car and the said bars have their free ends bent angularly toward each other to provide short shafts or trunnions for rollers 9 that are received in the usual channels of the I beam rails 3.

F ixedly secured to the bottom of the boxlikc member or basket 6 there is a second cable 10. This cable is trained to a sheave or pulley wheel 11 that has its shaft 12 journaled in suitable bearings in the bifurcated portion of a support 13 that is liXedlysecured to the floor at the outer side of the derrick and the end of the cable 10 is liXedly secured to the rear wall, adjacent to the bottom of the car 7.

Swivelly connected, as at 14, to one side of the car there is a hook 15 and this hook is designed to be swung over any portion of the derrick frame tor holding the car at desired elevations thereon.

The boi'- G and the car 7 are counter-balanced. As the car 7 is ,of a comparatively heavy structure weights 1G are placed in the bof; 6. Assuming that the car has made its full descent and the box 6 is fully elevated, the operator places himself in the car and grasping the Lcable 10 exerts a downward pull thereon, which, ofcourse, lWill lower the Lbox as the car ascends. rlhe-ear and box will meet at approximately thecenter of the derrick. It is to be noted that the box v6 is of an open construction, so that the opsaid .portion vof the saidcable at differentl elevations, the car will make its full ascension. As the car and the box are counterbalanced :the operator, after making' repairs or ,attaching parts `to `the top foi the dem-ick, when he lagain Vplaces his weight inthe car `'l' .itavill:automaticallydescend. The rapidity of the downward movementof thecar 7 regulated by .ther'operator grasping the part oit the cable 5 which is attached to the box 6, 'thereafter graspingr the box 6 when the ear yis :in .a line therewith and thereafter grasping ythe cablev l0 at different parts thereof and thereby steadying the descent of the car 7.

The simplicity `of the construction and the .advantages thereof will it yis thought be iapparentto thoseskilled in the art to` which such linventicni relates, but l desire lit understood that l do not wish tobe vrestricted ,totheprecise details herein set forth and, therefore, hold myself entitled Vto 4make `such changes therefrom las fairly fall within the scope of what I-claim.

of a Vertical track secured on one side thereof,and-comprising a pair of spaced rails each Vin the nature of an l beam, a car havingrollers which are journaled in the outer channels of the I beam, a box designed for the reception .ofr'weights and which is arranged for movement between the inner channels oi' the I beams, grooved wheels centrally fixed at the top and at the bottom of the frame between the rails of the car, a cable secured to the topY o' ,the car trained over the upper ygrooved wheel and secured to the top of the weight carrying box, a second cable secured to the bottom of the weight carrying box, trained over the lower grooved wheel and secured to the car.

2. The combination with a derrick frame, of a man-lift therefor including a vertically disposed track secured to .one sidefof the derrick frame comprising a pair of spaced rails, olf Erbe-am construction, a weight carryn box movable in the inner channels of the rails, a car comprisin an open member having substantially U-shaped spaced rods secured thereon and extending rearwardly tl'ierefroni and having,` their ends inturned `to provide trunnions, rollers jour-naled on the trunnions and received lin the outer grooves, oi' the rails, upper and lower fgrooved wheels lixedly secured between the rails ofthe track, a cable. lixedly secured to the car, Yt'ained over the upper groovedfwheel and'lixedto the top `or the box and a second cable lixed to thelbottom ofthe box,:trained to :the lower wheel-and ixedly secured to theicar.

In testil'nony whereof I aflix mysignature.

PETER R. MEADVl-LLE. 

